Flutter image_picker post upload an image

Question

I am using the Flutter Plugin Image_picker to choose images so that I want to upload image after selected the image

Future<File> _imageFile; void _onImageButtonPressed(ImageSource source) async { setState(() { _imageFile = ImagePicker.pickImage(source: source); }); }

I find this code in flutter documentation but its not work

var uri = Uri.parse("http://pub.dartlang.org/packages/create"); var request = new http.MultipartRequest("POST", url); request.fields['user'] = '[email protected]'; request.files.add(new http.MultipartFile.fromFile( 'package', new File('build/package.tar.gz'), contentType: new MediaType('application', 'x-tar')); request.send().then((response) { if (response.statusCode == 200) print("Uploaded!"); });

i want the user select the image in the gallery the post it to the server — user3903484
– user3903484, Commented May 6, 2018 at 11:53

Shyju M · Accepted Answer · 2018-05-07 05:38:36Z

Use MultipartRequest class

Upload(File imageFile) async { var stream = new http.ByteStream(DelegatingStream.typed(imageFile.openRead())); var length = await imageFile.length(); var uri = Uri.parse(uploadURL); var request = new http.MultipartRequest("POST", uri); var multipartFile = new http.MultipartFile('file', stream, length, filename: basename(imageFile.path)); //contentType: new MediaType('image', 'png')); request.files.add(multipartFile); var response = await request.send(); print(response.statusCode); response.stream.transform(utf8.decoder).listen((value) { print(value); }); }

Check this answer

Supun Dewapriya · Accepted Answer · 2020-05-20 23:16:12Z

This code works properly. Used MultipartRequest class

 void uploadImage() async { File _image; File pickedImage = await ImagePicker.pickImage(source: ImageSource.camera); setState(() { _image = pickedImage; }); // open a byteStream var stream = new http.ByteStream(DelegatingStream.typed(_image.openRead())); // get file length var length = await _image.length(); // string to uri var uri = Uri.parse("enter here upload URL"); // create multipart request var request = new http.MultipartRequest("POST", uri); // if you need more parameters to parse, add those like this. i added "user_id". here this "user_id" is a key of the API request request.fields["user_id"] = "text"; // multipart that takes file.. here this "image_file" is a key of the API request var multipartFile = new http.MultipartFile('image_file', stream, length, filename: basename(_image.path)); // add file to multipart request.files.add(multipartFile); // send request to upload image await request.send().then((response) async { // listen for response response.stream.transform(utf8.decoder).listen((value) { print(value); }); }).catchError((e) { print(e); }); }

name spaces:

 import 'package:path/path.dart'; import 'package:async/async.dart'; import 'dart:io'; import 'package:http/http.dart' as http;

when upgrade flutter, you will have those problems. i will check and post the new code
Just use getImage like below instead :: final ImagePicker _picker = ImagePicker(); final PickedFile image = await _picker.getImage( source: ImageSource.camera, imageQuality: 50 )

oblomov · Accepted Answer · 2021-06-04 13:26:13Z

If you want the uploading function to return the server response, you can use toBytes() instead of transform(), in order to wait until data transmission is complete.

Future<String> upload() async { String responseString = ''; // Pick image final image = await ImagePicker().getImage( source: ImageSource.gallery // or ImageSource.camera imageQuality: 100, maxWidth: 1000, ); // Convert to File final file = File(image.path); // Set URI final uri = Uri.parse('URL'); // Set the name of file parameter final parameter = 'Name'; // Upload final request = http.MultipartRequest('POST', uri) ..files.add(await http.MultipartFile.fromPath(parameter, file.path)); final response = await request.send(); if (response.statusCode == 200) { responseString = String.fromCharCodes(await response.stream.toBytes()); } return responseString; }

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